Open Source Metering and Usage Based Billing API ⭐️ Consumption tracking, Subscription management, Pricing iterations, Payment orchestration & Revenue analytics
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Polar — A billing platform for the intelligence era
Open-Source Subscription Billing & Payments Platform
- killbill
- billing
- payments
- subscriptions
A modern SaaS template/boilerplate built with SvelteKit, Tailwind, and Supabase. Includes marketing page, blog, subscriptions, auth, user dashboard, user settings, pricing page, and more.
- cloudflare
- saas
- saas-boilerplate
- saas-tools
A Terminal-style trading dashboard built entirely on free public market data. No API keys, no subscriptions.
PHP Payment processing library. It offers everything you need to work with payments: Credit card & offsite purchasing, subscriptions, payouts etc.
Flare is a lightweight, developer-friendly Swift framework that simplifies working with in-app purchases. It provides a clean, unified API over StoreKit and StoreKit 2, includes async/await-ready workflows, and offers built-in UI components for a seamless integration experience.
- iap
- in-app-purchases
- macos
- swift
The PayPal Server SDK provides integration access to the PayPal REST APIs.
- api-integration
- checkout
- orders
- payments